rhi: Run cleanup callbacks before the pending deletes

If a callback deleteLaters a QRhiResource that should still be
handled and not left unreleased. Swap the order.

Change-Id: I8419a28a9db5bb59f768ab5820dfaf593464d6d2
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
(cherry picked from commit d907f1aa92dbd4500a18db2c2492491c34c66087)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/gui/rhi/qrhi.cpp

@@ -7904,11 +7904,11 @@ QRhi::~QRhi()
     if (!d)
         return;
 
+    runCleanup();
+
     qDeleteAll(d->pendingDeleteResources);
     d->pendingDeleteResources.clear();
 
-    runCleanup();
-
     d->destroy();
     delete d;
 }